Name: ______Period: ______Date: ______

Body Systems HW #2 Living Environment

1. Which sequence is listed in order from simplest to most complex?

  1. tissue  cell  organ system  organ
  2. cell  tissue  organ  organ system
  3. cell  tissue  organism  organ
  4. organism  tissue  organ  organ system

2. In the following diagram, nerve cell A is communicating with nerve cell B.

Write the name of the structures present on the membranes of nerve cell B

that enable it to detect a message from nerve cell A.

3. The activity of all human body systems is coordinated by:

  1. the secretion of hormones and the nervous system
  2. the interaction of nerve impulses with the excretory system
  3. the movement of digested food by the circulatory system
  4. the secretion of hormones and the respiratory system

4. Your finger brushes against a hot stove and you quickly pull away. Identify

which two human body systems work together to respond to this painful

stimulus and explain the specific interaction between them.

5. List the main parts of a neuron and describe their function.

6. Name the two major divisions of the nervous system. Briefly describe their components.

  1. Which is the gap between the axon of one neuron and the dendrite of a second neuron?
  2. Nerve impulse
  3. Node
  4. Reflex arc
  5. Synapse
  1. Identify the brain stem, cerebellum, and cerebrum in the diagram of the brain to the right.
  1. Describe a reflex arc.
  1. Which would be the effect of a malfunctioning neurotransmitter?
  2. A nerve impulse would be stopped in the brain
  3. A nerve impulse would be stopped in the spinal column
  4. An impulse could not cross the gap between neurons
  5. An impulse could not move along the axon of a neuron
  1. The spinal column is part of a major division of the nervous system called the ______.
  1. Compare and contrast the three types of neurons.
  1. What is the difference between a stimulus and an impulse?
  1. Describe the function of the myelin sheath on the axon of a neuron.
  1. How does a drug or alcohol influence the communication between

neurons?